The Virginia Court presently has jurisdiction of Your child support payments; the father of your daughter, will probably want Virginia to retain jurisdiction as long as you continue to live in Virginia so that if you decide to stop paying, it's easier to have a Virginia Court hold you in contempt (should the father wish to file such a petition), rather than transfer the case to Pennsylvania, file a Petition for Contempt in Pennsylvania and then wait to have it transferred to Virginia to find you.
As the mother of the child, you should file a Petition to Modify Custody and try to get primary physical custody of your daughter because the father's move to Pennsylvania will effectively eliminate your visitation rights with your daughter. Also, it is going to be very difficult for you to exercise your rights to joint legal custody from a distance, so those rights (although not eliminated) would be substantially curtailed. If you wish to do something about custody, I suggest you do it before he relocates to Pennsylvania.
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ANDREA, JD, LL.M., Taxation
Member, NY & PA Bar
DISCLAIMER: The facts stated herein are information only and are not intended, nor should be construed as legal advice or legal opinion and No Attorney-Client relationship is formed by asking questions and receiving information; laws vary from state to state and to protect your interests, you should seek local counsel